Polypropylene (PP) is extensively used in the automotive sector due to its excellent chemical resistance, low density, high melting point, and flexibility. Its application ranges from interior to exterior vehicle components. Inside vehicles, PP is often found in dashboards, seat covers, door trims, and airbag containers, thanks to its durability and ease of coloring. For vehicle exteriors, polypropylene is used in bumpers, cable insulation, and gas cans, where its impact resistance and flexibility are crucial. Moreover, polypropylene's lightweight nature contributes to fuel efficiency, a key factor in the design and manufacture of modern vehicles. Manufacturers appreciate PP for its recyclability, aligning with the growing demand for sustainable automotive materials. The broad application of polypropylene in the automotive industry underlines its versatility and the ongoing pursuit of materials that enhance vehicle performance while reducing environmental impact.

Gluing PVC to CPVC is technically possible using a specialized cement designed for both materials. However, it's important to note that their different thermal expansion rates and chemical compositions can lead to joint failure under stress or temperature changes. For applications where safety and durability are critical, it's best to avoid mixing these materials. If you have no other option, ensure you use a solvent cement specified for both PVC and CPVC, and follow the manufacturer's application instructions closely. As a rule of thumb, using the same material for all parts of your project is the safest approach.

To fix broken plastic polypropylene, one should first clean the surface with isopropyl alcohol to remove any grease or dirt. Using a plastic welding kit or a soldering iron designated for plastics, gently heat the edges of the broken pieces to meld them together. Alternatively, applying a polypropylene-specific adhesive is an effective solution, as not all adhesives are suitable for this type of plastic due to its low surface energy. After applying the adhesive, press the pieces firmly together and allow ample time to cure as per the adhesive manufacturer's instructions. It's important to note that the repair might not restore the item to its original strength, so handling the repaired item with care is advisable.